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  Photonic crystal aensors based on porous silicon

Pacholski, C. (2013). Photonic crystal aensors based on porous silicon. Sensors, 13(4), 4694-4713. doi:10.3390/s130404694.

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Pacholski, Claudia1, 2, Author              
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1Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society, ou_2364731              
2Biophysical Chemistry, Institute of Physical Chemistry, University of Heidelberg, 69120 Heidelberg, Germany, ou_persistent22              

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Free keywords: photonic crystal; porous silicon; sensor
 Abstract: Porous silicon has been established as an excellent sensing platform for the optical detection of hazardous chemicals and biomolecular interactions such as DNA hybridization, antigen/antibody binding, and enzymatic reactions. Its porous nature provides a high surface area within a small volume, which can be easily controlled by changing the pore sizes. As the porosity and consequently the refractive index of an etched porous silicon layer depends on the electrochemial etching conditions photonic crystals composed of multilayered porous silicon films with well-resolved and narrow optical reflectivity features can easily be obtained. The prominent optical response of the photonic crystal decreases the detection limit and therefore increases the sensitivity of porous silicon sensors in comparison to sensors utilizing Fabry-Pérot based optical transduction. Development of porous silicon photonic crystal sensors which allow for the detection of analytes by the naked eye using a simple color change or the fabrication of stacked porous silicon photonic crystals showing two distinct optical features which can be utilized for the discrimination of analytes emphasize its high application potential.

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Language(s): eng - English
 Dates: 2013-03-262013-02-082013-04-032013-04-09
 Publication Status: Published in print
 Pages: 20
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 Rev. Type: Peer
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Title: Sensors
Source Genre: Journal
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Publ. Info: MDPI
Pages: - Volume / Issue: 13 (4) Sequence Number: - Start / End Page: 4694 - 4713 Identifier: ISSN: 1424-8220
CoNE: https://pure.mpg.de/cone/journals/resource/1424-8220